This magenta lens is designed for use in waters where colors are more rich and vibrant. This unique product is designed to filter out blue wavelengths in the water, allowing your eyes to see the brilliant reds, oranges, yellows and green colors that are lost as a diver descends, for example, at a depth of 25 feet, red is no longer visible to the naked eye. At 75 feet, yellow looks greenish blue because the yellow light has been absorbed by the water. The Seavision¦ technology adjusts the color bands to allow users to actually see and enjoy the colors there in front of them. . Lens is a -1.25 right diopter